Answer:
Frequency, f = 10⁹ Hz
Explanation:
Microwave is a type of electromagnetic wave. The frequency of microwaves varies from 1 GHz to 1000 GHz.
Microwave oven is the device that uses microwaves to heat up material inside it. We know that 1 GHz is equal to 10⁹ Hz.
It means that option (2) i.e. 10⁹ Hz represents the form of energy used by microwave oven.
